Construct a 99% confidence interval for the population proportion
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Q: A 95% confidence interval for the true mean population value, P, is given by:
A: The confidence interval is defined as Point estimate ± Margin of error
Q: Find a 95% confidence interval
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A: Given: n=49X=2.9σ=18.7We have to find 95% confidence interval for mean μ.Zα/2=1.96
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Q: Construct the confidence interval for the population mean.
A: Answer:
Q: Construct a 95% confidence interval of the average.
A: Given : Y = 0.00039508 S = 0.0084646 n = 1,259
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A: The mean of the data is calculated as follows: x=1n∑xi=24.3986=4.066 The sample standard deviation…
Q: Determine the margin of error for the confidence interval for the mean: 62 <µ< 81 The margin of…
A: It is given that, the confidence interval is (62, 81).
Q: Determine the margin of error for the confidence interval for the proportion: 0.557 < μ< 0.837 The…
A: It is given that the confidence interval for proportion is as follows: 0.557 < µ < 0.837.
Q: construct a 90% confidence interval for the true population mean textbook weight.
A: Here given,n=48x¯=46 ouncesδ=8.2ouncesconfidence level=90%we have to find confidence interval for…
Q: 7. Why is a confidence interval also called a "margin of error"?
A: Margin of error allows us to feel confident a certain percentage of the time within a range of…
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A: Confidence interval for two sample proportion is calculated using the sample proportion and sample…
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Q: Construct a 95% confidence interval of the population proportion using the given information.
A: The sample proportion is, p^=xn=240300=0.8 From the table of critical values, the critical value for…
Q: construct a confidence interval at a 80% confidence level. stributed population.
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A: Given problem Given that a 90 percent confidence interval for a population mean indicates…
Q: - Find 99% confidence interval for the population proportion
A: here given n = 499 p ^ = sample proportion of women wear flats to work = 0.37
Q: What does the 95% represent in a 95% confidence interval
A: Solution CI=95%
Q: onstruct a 95 confidence interval for p.
A: Here use confidence interval for proportion
Q: Construct a 95% confidence interval for the population standard
A: here given sample size n = 30 sample standard deviation = s= 7.1
Q: What does a 95% confidence interval actually mean?
A: We have to interprete the 95% confidence interval for the actual mean.
Q: Determine the margin of error for the confidence interval for the mean: 62 <µ<81 The margin of error…
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Q: Determine the margin of error for the confidence interval for the mean: 67 < µ< 80
A: We know that the If we have a confidence interval, then its Margin of Error is defined as E =…
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Q: Does the confidence interval not change for population proportion vs sample proportion
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Q: What is the standard confidence limit to determine if a sample should be included in a population?
A: Confidence limit is defined as the values at the upper and lower end of a confidence interval.
Q: identify the population proportion, the value of margin of error E, and construct the confidence…
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Q: Determine the margin of error for the confidence interval for the mean: 61<µ< 86 The margin of error…
A: Solution: From the given information, the confidence interval for the mean is 61<µ<86. Then,…
Q: A 90% confidence interval for a population mean is (10, 20). What is the margin of error of the…
A: Given alpha=0.10, CI=(10,20)
Q: Determine the margin of error for the confidence interval for the mean: 23 +1.7 The margin of error…
A: Confidence Interval is an inference process that is used to estimate the population parameter. The…
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A: Given that sample size n = 20 Sample mean = 0.9270 Standard error of mean is SEmean = 0.0180 At 95%…
Q: 5, find a 90% confidence interval for the population mean.
A: Given that Population standard deviation (σ) = 1.3 hours Random sample size (n) =55 Sample mean…
Q: Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence…
A: Solution: From the given information, p=0.85, n=201 and the confidence level is 0.995.
Q: What is the 95% confidence interval for population proportion?
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Q: . Construct a 95% confidence interval base on the same data.
A: Need to construct 95% Confidence Interval
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Q: What is a confidence interval
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- According to a recent study, 150 of 468 CEOs in a certain country are extremely concerned about Cyber threats. Complete part (a) below. Construct a 95% confidence interval estimate for the population proportion of CEOs in the country who are extremely concerned about cyber threats. ___ ≤P≤ ___ (Round to four decimal places as needed.) Interpret the intervals in (a) . Which of the following is the correct interpretation for the interval in (a)? A. You can be 95% confident that the population proportion of all CEOs in the country who are extremely concerned about cyber threats lies within the interval in (a). B. You can be 95% confident that the population proportion of the CEOs in the country surveyed who are extremely concerned about cyber threats lies within the interval in (a). C. The population proportion of the CEOs surveyed who are extremely concerned about cyber threats lies within the interval in (a) 95% of the time. D. The population…A sample of n = 200 college students are asked if they believe in extraterrestrial life and 120 of these students say that they do. The data are used to test if more than half of college students believe in extraterrestrial life. d. Find a 95% confidence interval e. Write a conclusion for the confidence intervalA New York Times article reported that a survey conducted in 2014 included 36,000 adults, with 3.72% of them being regular users of e-cigarettes. Because e-cigarette use is relatively new, there is a need to obtain today's usage rate. How many adults must be surveyed now if a confidence level of 90% and a margin of error of 2.5 percentage points are wanted? Complete parts (a) through (c) below. a. Assume that nothing is known about the rate of e-cigarette usage among adults. n = ____________ b. Use the results from the 2014 survey. n = ______________
- In a survey conducted by CNN, 130 of the 250 people that were randomly surveyed have a savings account. (a) Construct a 90% confidence interval to estimate the true population proportion of people that have a savings account. (b) Suppose CNN is going to conduct this survey a second time. If we want our estimate to be within 3% of the true population proportion with 90% confidence, how many people do we need to sample?A New York Times article reported that a survey conducted in 2014 included 36,000adults, with 3.71%of them being regular users of e-cigarettes. Because e-cigarette use is relatively new, there is a need to obtain today's usage rate. How many adults must be surveyed now if a confidence level of 95% and a margin of error of 3 percentage points are wanted? Complete parts (a) through (c) below. a. Assume that nothing is known about the rate of e-cigarette usage among adults. n=. (enter your response here ) (Round up to the nearest integer.) Part 2 b. Use the results from the 2014 survey. n=. (enter your response here) (Round up to the nearest integer.) Part 3 c. Does the use of the result from the 2014 survey have much of an effect on the sample size? A. Yes, using the result from the 2014 survey only slightly increases the sample size. B. Yes, using the result from the 2014 survey dramatically reduces the sample size. C. No, using the…. A researcher collects a sample of 24 measurements from a population and wishes to find a 99% confidence interval for the population mean. What value should he use for t*? b. If he instead decides to use a 95% confidence interval, will the interval be wider or be narrower or stay the same? Why?
- A New York Times article reported that a survey conducted in 2014 included 36,000 adults, with 3.66% of them being regular users of e-cigarettes. Because e-cigarette use is relatively new, there is a need to obtain today's usage rate. How many adults must be surveyed now if a confidence level of 95% and a margin of error of 2 percentage points are wanted? Complete parts (a) through (c) below. a. Assume that nothing is known about the rate of e-cigarette usage among adults. n=enter your response here (Round up to the nearest integer.) b. Use the results from the 2014 survey. n=enter your response here (Round up to the nearest integer.)An arborist is interested in determining the mean diameter (in centimeters) of mature white oak trees at a certain height above the base. She measures 7 of these trees and finds the following sample statistics : x̄= 49.09 and s= 13.80. Construct a 95% confidence interval for the mean diameter of a mature white oak tree.Which store do you think is more expensive—physical or online? A recent survey found that 45% of people aged 20 to 40 thought that physical stores were more expensive. To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within 0.05 of the population proportion, how many people aged 20 to 40 need to be sampled? (PHStat) To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within 0.05 of the population proportion, how many people aged 20 to 40 need to be sampled? (PHStat) Compare the results of (a) and (b).
- The figure to the right shows the results of a survey in which 1005 adults from Country A, 1023 adults from Country B, 995 adults from Country C, 1020 adults from Country D, and 1012 adults from Country E were asked whether national identity is strongly tied to birthplace. Country A37%22%27%49%Country BCountry CCountry DCountry E10% Construct a 99% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. The 99% confidence interval for the proportion of adults from Country B who say national identity is strongly tied to birthplace is enter your response here ,enter your response here . (Round to three decimal places as needed.)The figure to the right shows the results of a survey in which 1005 adults from Country A, 1023 adults from Country B, 995 adults from Country C, 1020 adults from Country D, and 1012 adults from Country E were asked whether national identity is strongly tied to birthplace. Country A37%22%27%49%Country BCountry CCountry DCountry E10% Construct a 99% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. Question content area bottom Part 1 The 99% confidence interval for the proportion of adults from Country A who say national identity is strongly tied to birthplace is (enter your response here ,enter your response here ). (Round to three decimal places as needed.)
